CASCACascade Atlas

Evidence dossier

CVE-2025-35939

Craft CMS stores user-provided content in session files

55.4–74.4Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

Craft CMS stores arbitrary content provided by unauthenticated users in session files. This content could be accessed and executed, possibly using an independent vulnerability. Craft CMS redirects requests that require authentication to the login page and generates a session file on the server at '/var/lib/php/sessions'. Such session files are named 'sess_[session_value]', where '[session_value]' is provided to the client in a 'Set-Cookie' response header. Craft CMS stores the return URL requested by the client without sanitizing parameters. Consequently, an unauthenticated client can introduce arbitrary values, such as PHP code, to a known local file location on the server. Craft CMS versions 5.7.5 and 4.15.3 have been released to address this issue.

State
PUBLISHED
Published
May 7, 2025
Updated
Feb 26, 2026
Evidence coverage
72%
CISA KEVCatalog member

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

FIRST EPSS1.17%

2026-07-18 · v2026.06.15 · percentile 64.0%

Source stateConflict visible

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

cisa-cgoriginal assertion
container

Craft CMS stores user-provided content in session files

CISA KEVoriginal assertion
observed_exploitation

Craft CMS External Control of Assumed-Immutable Web Parameter Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.011740000000; percentile 0.640050000000

Applicability

Cited product scope

Trace impact →
CraftCMS
[{"status": "affected", "version": "0", "lessThan": "5.7.5", "versionType": "custom"}, {"status": "unaffected", "version": "5.7.5"}, {"status": "affected", "version": "0", "lessThan": "4.15.3", "versionType": "custom"}, {"status": "unaffected", "version": "4.15.3"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:craftcms:craft_cms:*:*:*:*:*:*:*:*; end excluding 4.15.3supported
Unknown vendorUnknown product
cpe:2.3:a:craftcms:craft_cms:*:*:*:*:*:*:*:*; start including 5.0.0; end excluding 5.7.5supported

Assessments

CVSS by origin

5.3
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
6.9
9119a7d8-5eab-497f-8521-727c672e3725CVSS 4.0 · role SecondaryCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
5.3
9119a7d8-5eab-497f-8521-727c672e3725CVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
6.9
cisa-cgCVSS 4.0 · role unknownCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
5.3
cisa-cgCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.